Re: [PATCH] platform/x86: ideapad-laptop: Stop sending KEY_TOUCHPAD_TOGGLE

On Thu, 30 Mar 2023 at 21:46:44 +0200, Hans de Goede wrote:

Commit 5829f8a897e4 ("platform/x86: ideapad-laptop: Send KEY_TOUCHPAD_TOGGLE on some models") made ideapad-laptop send KEY_TOUCHPAD_TOGGLE when we receive an ACPI notify with VPC event bit 5 set and the touchpad-state has not been changed by the EC itself already.

This was done under the assumption that this would be good to do to make the touchpad-toggle hotkey work on newer models where the EC does not toggle the touchpad on/off itself (because it is not routed through the PS/2 controller, but uses I2C).

But it turns out that at least some models, e.g. the Yoga 7-15ITL5 the EC triggers an ACPI notify with VPC event bit 5 set on resume, which would now cause a spurious KEY_TOUCHPAD_TOGGLE on resume to which the desktop environment responds by disabling the touchpad in software, breaking the touchpad (until manually re-enabled) on resume.

Oh gosh, the touchpad toggle on Ideapads is so much broken, I wonder how the Windows driver deals with all this variety of different behaviors (unless it's broken too :D).

I'll test the patch on Z570, but as I see, it shouldn't change anything for Z570.

It was never confirmed that sending KEY_TOUCHPAD_TOGGLE actually improves things on new models and at least some new models like the Yoga 7-15ITL5 don't have a touchpad on/off toggle hotkey at all, while still sending ACPI notify events with VPC event bit 5 set.

So it seems best to revert the change to send KEY_TOUCHPAD_TOGGLE when receiving an ACPI notify events with VPC event bit 5 and the touchpad state as reported by the EC has not changed.

Note this is not a full revert the code to cache the last EC touchpad state is kept to avoid sending spurious KEY_TOUCHPAD_ON / _OFF events on resume.

Fixes: 5829f8a897e4 ("platform/x86: ideapad-laptop: Send KEY_TOUCHPAD_TOGGLE on some models") Link: https://bugzilla.kernel.org/show_bug.cgi?id=217234 Cc: stable@vger.kernel.org Signed-off-by: Hans de Goede hdegoede@redhat.com

---

drivers/platform/x86/ideapad-laptop.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c index b5ef3452da1f..35c63cce0479 100644 --- a/drivers/platform/x86/ideapad-laptop.c +++ b/drivers/platform/x86/ideapad-laptop.c @@ -1170,7 +1170,6 @@ static const struct key_entry ideapad_keymap[] = { { KE_KEY, 65, { KEY_PROG4 } }, { KE_KEY, 66, { KEY_TOUCHPAD_OFF } }, { KE_KEY, 67, { KEY_TOUCHPAD_ON } },

• { KE_KEY, 68, { KEY_TOUCHPAD_TOGGLE } }, { KE_KEY, 128, { KEY_ESC } },

/* @@ -1526,18 +1525,16 @@ static void ideapad_sync_touchpad_state(struct ideapad_private *priv, bool send_ if (priv->features.ctrl_ps2_aux_port) i8042_command(&param, value ? I8042_CMD_AUX_ENABLE : I8042_CMD_AUX_DISABLE);

• if (send_events) {

• /*
  

•  * On older models the EC controls the touchpad and toggles it
  

•  * on/off itself, in this case we report KEY_TOUCHPAD_ON/_OFF.
  

•  * If the EC did not toggle, report KEY_TOUCHPAD_TOGGLE.
  

•  */
  

• if (value != priv->r_touchpad_val) {
  

• 	ideapad_input_report(priv, value ? 67 : 66);
  

• 	sysfs_notify(&priv->platform_device->dev.kobj, NULL, "touchpad");
  

• } else {
  

• 	ideapad_input_report(priv, 68);
  

• }
  

• /*

• * On older models the EC controls the touchpad and toggles it on/off
  

• * itself, in this case we report KEY_TOUCHPAD_ON/_OFF. Some models do
  

• * an acpi-notify with VPC bit 5 set on resume, so this function get
  

• * called with send_events=true on every resume. Therefor if the EC did
  

• * not toggle, do nothing to avoid sending spurious KEY_TOUCHPAD_TOGGLE.
  

• */
  

• if (send_events && value != priv->r_touchpad_val) {

• ideapad_input_report(priv, value ? 67 : 66);
  

• sysfs_notify(&priv->platform_device->dev.kobj, NULL, "touchpad");
  

  }

priv->r_touchpad_val = value; -- 2.39.1